---
title: Constants
description: An API that provides system information that remains constant throughout the lifetime of your app's installation.
sourceCodeUrl: 'https://github.com/expo/expo/tree/main/packages/expo-constants'
packageName: 'expo-constants'
platforms: ['android', 'ios', 'tvos', 'web']
---

import APISection from '~/components/plugins/APISection';
import { APIInstallSection } from '~/components/plugins/InstallSection';

`expo-constants` provides system information that remains constant throughout the lifetime of your app's installation.

## Installation

<APIInstallSection />

## API

```js
import Constants from 'expo-constants';
```

<APISection packageName="expo-constants" apiName="Constants" />
